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deal.II Copyright and License

This directory contains the deal.II library.

The deal.II library is copyrighted by the deal.II authors. This term refers to the people listed in the file AUTHORS and in the authors list on the webpage.

The deal.II library is free software; it is licensed under the GNU Lesser General Public License v2.1 or later. The deal.II authors are in the process of relicensing the library to be dual-licensed under the Apache License 2.0 with LLVM Exception and the GNU Lesser General Public License v2.1 or later. As such we require all new code contributions to the library to be dual licensed as outlined below.

Contributions

As a contributor to this project, you agree that all of your contributions to deal.II (a) be governed by the Developer Certificate of Origin version 1.1, and (b) be made available to the project under the terms of the Apache License 2.0 with LLVM Exception, and separately under the terms of the GNU Lesser General Public License v2.1 or later. The deal.II project does not require copyright assignments for contributions. This means that the copyright for code contributions in the deal.II project is held by its respective contributors.

Referencing the library

In addition to the terms imposed by the licenses, we ask for the following courtesy:

  • Every publication presenting numerical results obtained with the help of deal.II should state the name of the library and cite appropriate deal.II references listed at the top of the publications page.

This is the usual, fair way of giving credit to contributors to a scientific result. In addition, it helps us justify our effort in developing deal.II as an academic undertaking.

We keep a list of publications using deal.II. Let us know about your publications so that we can add them to the aforementioned list. You can do this by emailing the reference information to one of the Principal Developers of deal.II.

Bundled third party software in the deal.II repository

The subdirectory bundled/ contains third party software. Please note that the software located there is copyrighted by their respective authors (independent of the deal.II authors) and are covered by different licenses.

The libraries listed above are all open source and as such place few restrictions on their use. However, if you want to distribute software developed with deal.II (in source or binary form) and you are using the packages above (with source code in bundled/), then they may impose different terms. Please consult the licenses of these packages for more information.

Alternatively, the configuration process of deal.II allows you to remove the bundled/ directory entirely, or disable any or all of these bundled libraries. In that case, you can not use their functionality but you also are not restricted by their license.

Contact

For further questions regarding licensing and commercial use please contact (one of) the deal.II principal developers directly.

Developer Certificate of Origin
Version 1.1

Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
1 Letterman Drive
Suite D4700
San Francisco, CA, 94129

Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.


Developer's Certificate of Origin 1.1

By making a contribution to this project, I certify that:

(a) The contribution was created in whole or in part by me and I
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(b) The contribution is based upon previous work that, to the best
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    by me, under the same open source license (unless I am
    permitted to submit under a different license), as indicated
    in the file; or

(c) The contribution was provided directly to me by some other
    person who certified (a), (b) or (c) and I have not modified
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(d) I understand and agree that this project and the contribution
    are public and that a record of the contribution (including all
    personal information I submit with it, including my sign-off) is
    maintained indefinitely and may be redistributed consistent with
    this project or the open source license(s) involved.

Full text of the Apache License 2.0

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This section is intended to make thoroughly clear what is believed to
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  12. If the distribution and/or use of the Library is restricted in
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  13. The Free Software Foundation may publish revised and/or new
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Such new versions will be similar in spirit to the present version,
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Each version is given a distinguishing version number.  If the Library
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  14. If you wish to incorporate parts of the Library into other free
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                            NO WARRANTY

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                     END OF TERMS AND CONDITIONS

           How to Apply These Terms to Your New Libraries

  If you develop a new library, and you want it to be of the greatest
possible use to the public, we recommend making it free software that
everyone can redistribute and change.  You can do so by permitting
redistribution under these terms (or, alternatively, under the terms of the
ordinary General Public License).

  To apply these terms, attach the following notices to the library.  It is
safest to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least the
"copyright" line and a pointer to where the full notice is found.

    <one line to give the library's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
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Also add information on how to contact you by electronic and paper mail.

You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the library, if
necessary.  Here is a sample; alter the names:

  Yoyodyne, Inc., hereby disclaims all copyright interest in the
  library `Frob' (a library for tweaking knobs) written by James Random Hacker.

  <signature of Ty Coon>, 1 April 1990
  Ty Coon, President of Vice

That's all there is to it!